<!--
 * @Description: 
 * @Author: zhuying
 * @Date: 2024-11-11 19:12:04
 * @LastEditors: rendc
 * @LastEditTime: 2024-11-11 19:28:20
-->
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>14-DOM课堂练习.html</title>
</head>
<body>
    <img id="h1" src="off.gif"> <br><br>

    <div class="cls">杰普软件</div> <br>
    <div class="cls">Java程序员</div> <br>
    
    <input type="checkbox" name="hobby"> 电影
    <input type="checkbox" name="hobby"> 旅游
    <input type="checkbox" name="hobby"> 游戏
    
</body>
<script>
    //1. 点亮灯泡 : src 属性值
    //首先获取img标签对象
    var img = document.getElementById('h1');
    //然后修改img标签对象的src属性值，进行图片的切换
    img.src = "on.gif";
    //2. 将所有div标签的内容后面加上: very good (红色字体) -- <fontcolor='red'></font>
    var divs = document.getElementsByTagName('div');
    for (let i = 0; i < divs.length; i++) {
    const div = divs[i];
    div.innerHTML += " <font color='red'>very good</font>";
    }
    // //3. 使所有的复选框呈现选中状态
    var ins = document.getElementsByName('hobby');
    for (let i = 0; i < ins.length; i++) {
    const check = ins[i];
    check.checked = true;//选中
    }
    </script>

</html>